Compaq AlphaServer ES40 Manuel d'utilisateur télécharger pdf (Page 10)

System I/O

Two industry-standard PCI I/O buses allow you to use

inexpensive, widely available I/O options. Both 32-bit and

64-bit PCI options can be used; 3.3V and 5V options are

supported.

The industry-standard PCI bus is the number one choice for

high-performance I/O options, such as disk storage and high-

performance video applications.

The PCI bus implementation has the following characteristics:

•

Fully compliant with the PCI Version 2.1 Specification

•

Operates at 33 MHz, delivering a peak bandwidth of 500

MB/sec; over 250 Mbytes/sec for each PCI bus

•

6 option slots (Model 1) or 10 option slots (Model 2)

•

Supports three address spaces: PCI I/O, PCI memory, and

PCI configuration space

•

Supports byte/word, tri-byte, and longword operations

•

Exists in noncached address space only

Block Diagram of I/O Control

PK-0319A-98

P-chip 0

Flash ROM

Interrupts

Acer Labs

1543C Chip

Config

(NVRAM functions)

P-chip 1

Keyboard

Mouse

CD-ROM

USB

COM1

COM2

Modem

Printer

Floppy

PCI 0

PCI 1

PCI Slot

C-chip

I/O Implementation

In a Model 2 system that has 10 I/O slots, PCI 0 has 4 slots,

and PCI 1 has 6 slots. In a Model 1 system with 6 slots, each

PCI has 3 slots.

The Acer Labs 1543C chip provides the bridge from PCI 0 to

ISA. The C-chip controls accesses to memory on behalf of

both P-chips.

I/O Configuration Rules

A VGA controller, if present, must be installed in PCI 0.

I/O Ports

At the rear of the system are connectors offering access to two

serial communications ports, one modem port for the remote

management console, one parallel port, ports for the keyboard

and mouse, and two USB ports. Two SCSI breakouts are also

on the back panel.

Pedestal/Rack

PK-0325-99

1 2 3 4 5 6 7

1. RMC modem port

2. COM2 serial port

3. Keyboard port

4. Mouse port

5. COM1 serial port

6. USB ports

7. Parallel port

8. SCSI breakouts

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 16 17 18

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Compaq AlphaServer ES40 Manuel d'utilisateur Page 10

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